CN113676791A - Distributed synchronous data acquisition system of linear array structure - Google Patents
Distributed synchronous data acquisition system of linear array structure Download PDFInfo
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- CN113676791A CN113676791A CN202111230569.3A CN202111230569A CN113676791A CN 113676791 A CN113676791 A CN 113676791A CN 202111230569 A CN202111230569 A CN 202111230569A CN 113676791 A CN113676791 A CN 113676791A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0663—Performing the actions predefined by failover planning, e.g. switching to standby network elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/22—Alternate routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
Abstract
The invention discloses a distributed synchronous data acquisition system of a linear array structure, which is a linear array structure formed by a data server and N acquisition nodes in a back-to-back step-by-step interconnection and interval step-by-step interconnection mode through transmission lines; the data server is mainly used for collecting and processing data collected by all the collection nodes, the collection nodes are mainly responsible for collecting and uploading the data to the data server, and a main transmission channel and a standby transmission channel are formed between the server and the N collection nodes. Compared with the prior art, the fault point in the linear array can be actively found and fault isolation is carried out or a fault is bypassed through the standby channel, so that the fault tolerance capability of the linear array is greatly improved: when the port/transmission line in the linear array fails, a standby transmission channel can be started so as not to cause any influence on the linear array function; when the nodes in the linear array are in fault, the standby transmission channels can be switched without influencing the normal work of other nodes.
Description
Technical Field
The invention relates to the technical field of data acquisition and transmission, in particular to a distributed synchronous data acquisition system with a linear array structure.
Background
The distributed synchronous data acquisition and transmission technology is widely applied, and the most typical application scenes comprise data acquisition and transmission of a military linear array sonar wet-end distributed hydrophone, data acquisition and transmission of a marine petroleum exploration super-large-scale multi-cable multi-detector, a deep-sea thin cable sonar acquisition and transmission detection system and the like.
The linear array structure is a step-by-step interconnection array structure which is simple in structure and easy to expand, and is widely applied to distributed acquisition, but in the linear array structure formed by the back-to-back interconnection of simple nodes, the nodes are responsible for data acquisition and data forwarding of other nodes, so that the damage of a certain node necessarily affects the transmission of the data acquired by other nodes; in addition, in the application scenario, the linear array must be sealed and cabled before use, and once damaged, the maintenance is difficult, and the cost and the time cost are high.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provide a distributed synchronous data acquisition system with a linear array structure.
In order to achieve the purpose, the invention is implemented according to the following technical scheme:
a distributed synchronous data acquisition system of a linear array structure is a linear array structure formed by a data server and N acquisition nodes in a back-to-back step-by-step interconnection and interval step-by-step interconnection mode through transmission lines; the data server is mainly used for collecting and processing data collected by all the collection nodes, the collection nodes are mainly responsible for collecting and uploading the data to the data server, and a main transmission channel and a standby transmission channel are formed between the server and the N collection nodes.
Further, the data server includes a plurality of ports; each acquisition node comprises four ports, wherein two ports are main ports, and the other two ports are standby ports.
Furthermore, one main port of the first acquisition node is interconnected with one port of the data server, and the other main port of the first acquisition node is interconnected with one main port of the second acquisition node; sequentially, the other main port of the second acquisition node is interconnected with one main port of the third acquisition node, … …, the other main port of the (N-1) th acquisition node is interconnected with one main port of the Nth acquisition node, and the other main port of the Nth acquisition node is disconnected; and a main transmission channel is formed between the server and the N acquisition nodes.
Furthermore, one port of the data server is connected with one standby port of the second acquisition node, and one standby port of the first acquisition node is interconnected with one standby port of the third acquisition node; sequentially, the other standby port of the second acquisition node is interconnected with one standby port of the fourth acquisition node, … …, the other standby port of the (N-2) th acquisition node is interconnected with one standby port of the Nth acquisition node, and the (N-1) th acquisition node and the other standby port of the Nth acquisition node are disconnected; and a standby transmission channel is formed between the server and the N acquisition nodes.
Furthermore, the collection node comprises a port control module, a data collection and transmission module connected with the port control module, a node communication state monitoring module and a port state monitoring module;
the data acquisition and transmission module is mainly responsible for data acquisition and packaging and transmission on a designated port;
the node communication state monitoring module is responsible for monitoring the following information in real time: (1) collecting the communication state of the nodes and the data server; (2) collecting the communication state of the nodes and the interval nodes; respectively obtaining the states of 'packet reachable' and 'packet unreachable' and reporting the states to a port control module; the communication state is carried out in a mode of sending a request packet and receiving a response packet, the acquisition node actively sends the request packet to the data server/interval acquisition node at regular time, and the data server/interval acquisition node needs to reply the response packet when receiving the request packet; if the acquisition node receives the response packet within the specified time, the packet is considered to be reachable, and if the node does not receive the response packet after overtime, the packet is considered to be unreachable;
the port state monitoring module is responsible for monitoring the hardware state of the current reset port in real time, identifying the link-up or link-down state of the current port and reporting the link-up or link-down state to the port control module;
and the port control module is responsible for controlling the reset/reset of the port according to the states provided by the node communication state monitoring module and the port state monitoring module and outputting the current working port information to the node communication state monitoring module and the port state monitoring module.
Preferably, the port is a network port or a 485 interface.
Compared with the prior art, the fault point in the linear array can be actively found and fault isolation is carried out or a fault is bypassed through the standby channel, so that the fault tolerance capability of the linear array is greatly improved: when the port/transmission line in the linear array fails, a standby transmission channel can be started so as not to cause any influence on the linear array function; when the nodes in the linear array are in fault, the standby transmission channels can be switched without influencing the normal work of other nodes.
Drawings
Fig. 1 is a block diagram of a system configuration according to an embodiment of the present invention.
Fig. 2 is a structural block diagram of an acquisition node.
Fig. 3 is a flow chart of the port control module for determining port abnormality.
Fig. 4 is a flowchart of the port control module of the acquisition node.
Fig. 5 is a block diagram of a system for normal operation of main transmission channels of all collection nodes according to an embodiment of the present invention.
Fig. 6 is a single transmission line fault recovery diagram in accordance with one embodiment of the present invention.
FIG. 7 is a single collection node failure recovery graph in accordance with an embodiment of the present invention.
Fig. 8 is a diagram of two transmission line fault recovery in accordance with one embodiment of the present invention.
Fig. 9 is a failure recovery diagram of two collection nodes according to an embodiment of the present invention.
Fig. 10 is a diagram of a transmission line failure and a node failure recovery in accordance with an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. The specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
As shown in fig. 1, this embodiment provides a distributed synchronous data acquisition system with a linear array structure, where the system is a linear array structure formed by a data server and six acquisition nodes interconnected back-to-back step-by-step and interconnected step-by-step at intervals by transmission lines; the data server is mainly used for collecting and processing data collected by all the collection nodes, the collection nodes are mainly responsible for collecting and uploading the data to the data server, and a main transmission channel and a standby transmission channel are formed between the server and the six collection nodes.
As shown in fig. 1, the data server includes a plurality of ports; each acquisition node comprises four ports, namely a master port and a standby port, wherein the port is a network port or a 485 interface. A port I of the acquisition node 1 is interconnected with a port of a data server, and a port II of the acquisition node 1 is interconnected with a port I of the acquisition node 2; a port II of the acquisition node 2 is interconnected with a port I of the acquisition node 3, a port II of the acquisition node 3 is interconnected with a port I of the acquisition node 4, a port II of the acquisition node 4 is interconnected with a port I of the acquisition node 5, a port II of the acquisition node 5 is interconnected with a port I of the acquisition node 6, and a port II of the acquisition node 6 is disconnected; at this time, a main transmission channel is formed between the server and the six collection nodes.
One port of the data server is connected with one standby port of the second acquisition node, and a port (r) of the acquisition node 1 is interconnected with a port (r) of the acquisition node 3; the port (r) of the acquisition node (2) is interconnected with the port (r) of the acquisition node (4), the port (r) of the acquisition node (3) is interconnected with the port (r) of the acquisition node (5), the port (r) of the acquisition node (4) is interconnected with the port (r) of the acquisition node (6), and the ports (r) of the acquisition node (5) and the acquisition node (6) are disconnected; the acquisition node 1 and the acquisition node 2 are key nodes which are closer to the data server, and ports of the acquisition node 1 and the acquisition node 2 are connected with the port of the data server so as to further improve the redundancy; at this time, a standby transmission channel is formed between the server and the six acquisition nodes.
In hardware, the main transmission channel and the standby transmission channel are all in a connection state, and the acquisition node can independently control the opening and closing of the 4 ports through the embedded software, so that the on-off of the main transmission channel and the standby transmission channel is indirectly controlled. Besides data transmission, all nodes in the linear array need to monitor the following information in real time: (1) the status of the link to which it is connected; (2) connectivity to its alternate nodes; (3) and in the communication condition with the data server, when the link state or the node connectivity changes, the standby port and the standby transmission channel are automatically started. Therefore, in this embodiment, as shown in fig. 2, the collection node includes a port control module, and a data collection and transmission module, a node communication state monitoring module, and a port state monitoring module, which are connected to the port control module;
the data acquisition and transmission module is mainly responsible for data acquisition and packaging and transmission on a designated port;
the node communication state monitoring module is responsible for monitoring the following information in real time: (1) the connection state of the nodes and the data server; (2) the communication state of the node and an interval node (the node N is the interval node of the node N-2); respectively obtaining the states of 'packet reachable' and 'packet unreachable' and reporting the states to a port control module; the communication state is carried out in a mode of sending a request packet and receiving a response packet, the node actively sends the request packet to the data server/interval node at regular time, and the data server/interval node needs to reply the response packet within a specified time when receiving the request packet; if the node receives the response packet within the specified time, the node considers that the response is successful, and meanwhile, the node considers that the packet is reachable; if the node does not receive the response packet after overtime, the node considers that the response fails, and if the response fails for a plurality of times, the node considers that the packet is not reachable. The request packet/response packet may use an ICMP echo request and echo response message packet when the current interconnect structure type is ethernet, and may use a private packet when the current interconnect structure is 485 or the like. The process of sending request packets and receiving response packets is continuously carried out at fixed time intervals, and the parameter of the timing time interval is determined according to the type of the current interconnection structure and generally takes a value (M x the one-way delay of the interconnection hardware from the last node to the data server), wherein the value of M is more than 4;
the port state monitoring module is responsible for monitoring the hardware state of the current reset port in real time, identifying the link-up (indicating hardware connection) or link-down (indicating hardware disconnection) state of the current port and reporting the link-up or link-down state to the port control module;
the port control module is responsible for controlling the resetting/resetting of the port according to the information of the port state and the node communication state provided by the node communication state monitoring module and the port state monitoring module, and finally determining the current working port number; the port control module works in real time, so that the ports are quickly switched when a fault occurs, and the normal work of the linear array is recovered. The port control module controls the ports as follows:
(1) when the port control module finds the port link-down, the port is subjected to the following cyclic operation of 'port reset waiting time T a check the hardware connection state' and recording the number of times of port reset, if the port is in the link-down state in three continuous cycles, the port is considered to be 'hardware abnormal', and the processing is needed; and if the port is recovered to be in the link-up state in the circulation, clearing the port reset time counter and continuing monitoring. As shown in fig. 3, "latency T" is the latency between two operations, typically several milliseconds, depending on the current interconnect fabric type.
(2) The port control module records the continuous 'response failure' times of the port by using a counter, and if the port is found to have 'response failure', the response failure counter is increased by 1; if the port is found to have 'response success', a response failure counter is cleared; if the value of the response failure counter exceeds a specified maximum value after one response failure, the packet is considered to be unreachable. The maximum value of the number of response failures is determined according to the position of the current node, and is (N + 2), wherein N represents the node position, that is, the maximum value of the number of response failures of the node 1 is 3, and the maximum value of the number of response failures of the node 6 is 8.
The port control module is used as a core control module of the node, and fault recovery and bypass are carried out according to the information of ' port abnormity ' and ' port ' packet unreachable '. The workflow of the node is shown in fig. 4.
After each node is powered on, a master port is automatically started, and a master transmission channel is selected by default to carry out data transmission.
The port control module analyzes the real-time states of the two ports (i) and controls and switches the ports according to the following rules:
(1) for the port I, if the port I is found to be abnormal, the port III needs to be immediately reset, and a backup channel is started; if the port is normal, the connectivity between the port and the data server needs to be checked, and if the packet is not reachable, the port III needs to be immediately reset, and a backup channel is started;
(2) for the port II, if the port II is abnormal, the port II needs to be immediately reset, and a backup channel is started; if the port II is normal, the connectivity between the port II and the interval node needs to be checked, and if the packet is not reachable, the port II needs to be immediately reset, so that the backup channel is started.
The working process of the distributed synchronous data acquisition system with the linear array structure is as follows:
after the first power-on, all the standby ports (r) of all the nodes are in the idle reset state, and all the main ports (r) of all the nodes are in the normal working state, that is, the main transmission channels of all the nodes work normally, and the nodes transmit data through the main transmission channels, as shown in fig. 5. D1 represents data for node 1, D2 represents data for node 2, and so on. The data of all the nodes are finally uploaded through the port of the interconnection of the node 1 and the data server.
As shown in fig. 6, if an abnormality occurs in a transmission line in the main transmission channel, which may cause interruption of data transmission, the node associated with the abnormality actively releases the standby port, and enables the standby transmission channel. If the transmission line of the main transmission channel between the node 1 and the node 2 is abnormal, the node 2 actively releases the standby port to realize direct communication with the data server, and the whole linear array can still work normally. That is, in the linear array, when a transmission line at a certain position is damaged, the correct transmission of the data acquired by all the nodes is not influenced.
If a node in the main transmission channel is abnormal, all ports corresponding to the node cannot work normally, and data transmission is interrupted, the node adjacent to the abnormal node actively releases the standby port to start the standby transmission channel. As shown in fig. 7, if the node 2 is abnormal, the node 1 actively releases the standby port r, and the node 3 actively releases the standby port r, so that the node 3 and the node 1 can directly communicate with each other, and the whole linear array can still normally work except for the node 2. That is, when a certain node is damaged in the linear array, the normal work of other nodes is not influenced.
When a plurality of transmission lines or a plurality of nodes are abnormal, each abnormal point independently runs a recovery flow according to a rule, as shown in fig. 8 and 9, two transmission lines and two nodes are abnormal. After the recovery flow is completed, the fault is repaired and bypassed, respectively.
When a transmission line fault and a node fault occur simultaneously, the recovery process is also independently operated by each abnormal point according to rules, as shown in fig. 10, and an abnormal condition occurs in one transmission line and one node. After the recovery flow is completed, the fault is repaired and bypassed, respectively.
When other numbers or different combinations of failures occur, recovery can be performed according to the above rules.
Further, in order to verify the reliability of the distributed synchronous data acquisition system with the linear array structure, the node 6 at the end is taken as an example to illustrate the improvement of the system reliability. In a simple back-to-back interconnected linear array system with only a primary transmission channel, the data of node 6 can only be uploaded to a data server if the following conditions are met:
(1) the operation of 5 nodes from the node 1 to the node 5 is normal;
(2) all 6 transmission lines between nodes and between the nodes and the data server work normally;
if any node or transmission line is abnormal, the data of the node 6 cannot be uploaded to the data server.
In the present invention, the data of the node 6 can be uploaded under various abnormal conditions:
(1) node failure only
When only node faults occur, the abnormal faults of one node, two nodes and three nodes can be tolerated, namely the following three conditions respectively;
any one of the nodes 1-5 fails;
any two non-adjacent nodes in the nodes 1-5 simultaneously fail;
any three non-adjacent nodes in the nodes 1-5 simultaneously fail;
(2) only transmission line failure occurs
Since there are 2 paths for data of node 6 to be selected each time it passes through a node, there are 64 total selectable paths from node 6 to the data server. Therefore, when only transmission line faults occur, correct data transmission can be ensured as long as one path is normal;
(3) simultaneous node failure and transmission line failure
Like the two types of faults, the node fault directly causes the four ports of the node to be disabled, and the transmission line connected with the ports is abnormal, namely, compared with the node 6, the fault nature of other nodes is also the transmission line fault. Therefore, for the node 6, as long as one of the 64 optional paths is normal, correct data transmission can be guaranteed.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (6)
1. A distributed synchronous data acquisition system of a linear array structure is characterized in that the system is a linear array structure formed by a data server and N acquisition nodes in a back-to-back step-by-step interconnection and interval step-by-step interconnection mode through transmission lines; the data server is mainly used for collecting and processing data collected by all the collection nodes, the collection nodes are mainly responsible for collecting and uploading the data to the data server, and a main transmission channel and a standby transmission channel are formed between the server and the N collection nodes.
2. The distributed synchronous data acquisition system of a linear array structure as set forth in claim 1, characterized in that: the data server comprises a plurality of ports; each acquisition node comprises four ports, wherein two ports are main ports, and the other two ports are standby ports.
3. The distributed synchronous data acquisition system of a linear array structure as set forth in claim 2, characterized in that: one main port of the first acquisition node is interconnected with one port of the data server, and the other main port of the first acquisition node is interconnected with one main port of the second acquisition node; sequentially, the other main port of the second acquisition node is interconnected with one main port of the third acquisition node, … …, the other main port of the (N-1) th acquisition node is interconnected with one main port of the Nth acquisition node, and the other main port of the Nth acquisition node is disconnected; and a main transmission channel is formed between the server and the N acquisition nodes.
4. The distributed synchronous data acquisition system of a linear array structure as set forth in claim 2, characterized in that: one port of the data server is connected with one standby port of the second acquisition node, and one standby port of the first acquisition node is interconnected with one standby port of the third acquisition node; sequentially, the other standby port of the second acquisition node is interconnected with one standby port of the fourth acquisition node, … …, the other standby port of the (N-2) th acquisition node is interconnected with one standby port of the Nth acquisition node, and the (N-1) th acquisition node and the other standby port of the Nth acquisition node are disconnected; and a standby transmission channel is formed between the server and the N acquisition nodes.
5. The distributed synchronous data acquisition system of a linear array structure as set forth in claim 1, characterized in that: the acquisition node comprises a port control module, a data acquisition and transmission module, a node communication state monitoring module and a port state monitoring module, wherein the data acquisition and transmission module, the node communication state monitoring module and the port state monitoring module are connected with the port control module;
the data acquisition and transmission module is mainly responsible for data acquisition and packaging and transmission on a designated port;
the node communication state monitoring module is responsible for monitoring the following information in real time: (1) collecting the communication state of the nodes and the data server; (2) the connection state of the acquisition nodes and the interval acquisition nodes; respectively obtaining the states of 'packet reachable' and 'packet unreachable' and reporting the states to a port control module; the communication state is carried out in a mode of sending a request packet and receiving a response packet, the acquisition node actively sends the request packet to the data server/interval acquisition node at regular time, and the data server/interval acquisition node needs to reply the response packet when receiving the request packet; if the node receives the response packet within the specified time, the packet is considered to be reachable, and if the node does not receive the response packet after overtime, the packet is considered to be unreachable;
the port state monitoring module is responsible for monitoring the hardware state of the current reset port in real time, identifying the link-up or link-down state of the current port and reporting the link-up or link-down state to the port control module;
and the port control module is responsible for controlling the reset/reset of the port according to the states provided by the acquisition node communication state monitoring module and the port state monitoring module and outputting the current working port information to the node communication state monitoring module and the port state monitoring module.
6. The distributed synchronous data acquisition system of a linear array structure as set forth in claim 2, characterized in that: the port is a network port or a 485 interface.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103136911A (en) * | 2013-01-25 | 2013-06-05 | 北京硕人时代科技有限公司 | Low-power dissipation on-line collecting system and collecting method based on backup redundant data |
| US20130285828A1 (en) * | 2012-04-30 | 2013-10-31 | Korea Institute Of Geoscience & Mineral Resources | Submarine data relay system and method |
| CN104639552A (en) * | 2015-02-13 | 2015-05-20 | 李明 | Linked network wireless high-speed communication protocol |
| CN205792668U (en) * | 2016-05-26 | 2016-12-07 | 北京博维亚讯技术有限公司 | Multi-cascade link state monitoring system based on VRRP |
| CN109167667A (en) * | 2018-09-18 | 2019-01-08 | 武汉海晟科讯科技有限公司 | A kind of sensor data acquisition Transmission system and method based on PTP synchronization |
| WO2019028269A2 (en) * | 2017-08-02 | 2019-02-07 | Strong Force Iot Portfolio 2016, Llc | Methods and systems for detection in an industrial internet of things data collection environment with large data sets |
| CN109802877A (en) * | 2017-11-16 | 2019-05-24 | 长沙闽壹湖电子科技有限责任公司 | A kind of CAN bus based Communication System Design |
| CN110910625A (en) * | 2019-11-15 | 2020-03-24 | 浙江大学 | 485 bus-based seabed in-situ low-power consumption multi-node data acquisition system |
-
2021
- 2021-10-22 CN CN202111230569.3A patent/CN113676791A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130285828A1 (en) * | 2012-04-30 | 2013-10-31 | Korea Institute Of Geoscience & Mineral Resources | Submarine data relay system and method |
| CN103136911A (en) * | 2013-01-25 | 2013-06-05 | 北京硕人时代科技有限公司 | Low-power dissipation on-line collecting system and collecting method based on backup redundant data |
| CN104639552A (en) * | 2015-02-13 | 2015-05-20 | 李明 | Linked network wireless high-speed communication protocol |
| CN205792668U (en) * | 2016-05-26 | 2016-12-07 | 北京博维亚讯技术有限公司 | Multi-cascade link state monitoring system based on VRRP |
| WO2019028269A2 (en) * | 2017-08-02 | 2019-02-07 | Strong Force Iot Portfolio 2016, Llc | Methods and systems for detection in an industrial internet of things data collection environment with large data sets |
| CN109802877A (en) * | 2017-11-16 | 2019-05-24 | 长沙闽壹湖电子科技有限责任公司 | A kind of CAN bus based Communication System Design |
| CN109167667A (en) * | 2018-09-18 | 2019-01-08 | 武汉海晟科讯科技有限公司 | A kind of sensor data acquisition Transmission system and method based on PTP synchronization |
| CN110910625A (en) * | 2019-11-15 | 2020-03-24 | 浙江大学 | 485 bus-based seabed in-situ low-power consumption multi-node data acquisition system |
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